Defer `If` template resolution analogously to other functions

* all other functions sans `Cons` are resolved when the respective member `*::type` is instantiated
* this was changed soely to increase coherence

1 files changed, 2 insertions, 2 deletions

diff --git a/src/list/operation/higher/take_while.h b/src/list/operation/higher/take_while.h
index 1ee6736..27f58ed 100644
--- a/src/list/operation/higher/take_while.h
+++ b/src/list/operation/higher/take_while.h
@@ -10,14 +10,14 @@ template <
 	typename                 Current
 >
 struct TakeWhile {
-	typedef If<
+	typedef typename If<
 		Predicate<Head<Current>>::type::value,
 		Cons<
 			Head<Current>,
 			typename TakeWhile<Predicate, Tail<Current>>::type
 		>,
 		void
-	> type;
+	>::type type;
 };
 
 template <